Two-way two-dimensional pattern transferring upon requesting with BaTiO3 crystal

We propose a setup which is capable of transferring two-dimensional (2D) pictures from one plane to another in either way upon the requesting of the plane which wishes to obtain information from the other one. Since this picture transferring is purely optical, it is free of electromagnetic interference. The setup consists of a high-gain photorefractive BaTiO 3 crystal, and the crystal is set in a configuration of a Cat conjugator. The working principle of the setup relies on the mechanism of photorefractive self-pump phase conjugation and four-wave mixing.